package com.yc.d0316;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.FileInputStream;
import java.io.IOException;

@WebServlet("/upload/*")
public class GetUploadServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取资源地址
        final String uri = req.getRequestURI();
        //提取文件名
        final String filename = uri.replaceAll(".+/upload/(.+)","$1");
        //设置返回的内容类型
        //html ==> text/html ,jpg ==>image/jpeg
        final String mimeType = req.getServletContext().getMimeType(filename);
        resp.setContentType(mimeType);
        //将文件返回给浏览器
        //java.io流
        String path = UploadImageServlet.IMAGE_PATH + filename;
        try(FileInputStream fis = new FileInputStream(path)){
            byte[] buffer = new byte[1024];
            int count;
            final ServletOutputStream out= resp.getOutputStream();
            while ((count = fis.read(buffer))>-1){
                out.write(buffer,0,count);
            }
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}
